OTA · MSRP $999
William Optics Zenithstar 81 WIFD
Key specifications
| Aperture | 81 mm |
|---|---|
| Focal length | 559 mm |
| Focal ratio | f/6.9 |
| Weight | 3.55 kg |
All specifications
| Focuser type | WIFD rack-and-pinion, EAF compatible, 0-77 mm travel |
|---|---|
| Tube length | 526 mm |
| Dovetail | Vixen |
About
An 81 mm f/6.9 doublet APO refractor covering a 45 mm image circle, on the WIFD rack-and-pinion focuser with 77 mm of travel, an M92 rotator and an M92 to M63 adapter. Carries a dovetail that works as both Vixen and Arca-Swiss and takes the FLAT 6AIII reducer.